Courtney Robertson, who won Ben Flajnik's final rose on his edition of The Bachelor a couple years ago, is going where no bachelorette has gone before -- disclosing all the personal details of her overnight fantasy suite date with the show's star in graphic detail.

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DuringThe Bachelor's sixteenth season, Flajnik enjoyed overnight dates in Switzerland with Robertson, Lindzi Cox and Nicki Sterling. Robertson was given the third date and explained in her memoir that not only did she have sex with Flajnik -- multiple times -- she also didn't care if he wanted to make love to his other two remaining bachelorettes beforehand.

"I honestly wasn't worried about him hooking up with the other girls. In fact, I had encouraged it," Robertson dished in her upcoming memoir, I Didn't Come Here to Make Friends -- Confessions of a Reality Show Villain Courtney Robertson.

"While we were skinny-dipping, I told him I was crazy about him, but that if we were indeed going to get engaged, he should sow his oats. I had. I told him to take advantage of being a single man because once we were officially together, I'd be the last woman he'd ever make love to."

"'Do YOU,' I insisted. 'Explore your options.'"

Robertson said she made a pact with Flajnik never to talk about his overnight dates with Cox and Sterling. However, she wasn't shy to dive into the details of her own steamy fantasy suite date.

"Ten minutes after we were in the cottage, the camera crews, handlers, and producers scrammed, and we were completely alone for the first time ever. We immediately ripped each other's clothes off and had intense, passionate sex on the couch in front of the fire," Robertson wrote in an advance copy of the memoir obtained by Reality TV World.

"Producers had left a cell phone for us in case of emergency, but they did not leave us any condoms."

And Robertson and Flajnik certainly made love more than once that night.

"After sexual interlude number two, a sweet, slow lovemaking session in the bedroom, Ben and I lay facing each other, snuggling. We fit really well together," the model explained, adding that the couple then confessed how much they loved one another.

"When we weren't doin' it, we drank wine, did some naked hot tubbing, and listened to Bon Iver on his iPod. We talked about everything."

As if that's not enough, Robertson elaborated on whether the sex was great in her memoir. Flajnik probably won't be thrilled to read the following: "Our sex was pretty good, but pretty textbook. There was definitely room for improvement."

The bachelorette continued, "I wanted to see if Ben had a little more adventure in him, so I disappeared into the bathroom and came out wearing another naughty lingerie outfit I remembered to pack. Seeing the sexy black lace skirt with silk ribbons, Ben's tongue practically rolled to the floor like a cartoon. I could tell he was blown away."

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Robertson was convinced, however, there might be negative repercussions of coming on to Flajnik so strongly.

"[I] worried this might be too much too soon," she admitted. "He was so nervous he wasn't really sure what to do with me. So I kind of threw him around a little bit, and I'm pretty sure he liked it. We did every position under the sun, but I believe I sealed the deal when we successfully completed the reverse cowgirl."

After her intimate night with Flajnik, rather than grow more confident in her relationship with The Bachelor star, Robertson became wary and insecure.

"I'd never been a clingy-after-sex kind of person, but now my usual cool-girl demeanor was history," the former bachelorette wrote.

"Even though I'd told him to sow his oats, I found myself feeling possessive and jealous; the thought of him having sex with either girl made me sick. Couldn't he just stop this now so nobody got hurt?... But Ben was going to see this through to the bitter end. He was a by-the-book kind of guy."

Robertson had no reason to stress though, as Flajnik ended up proposing to her and dumping Cox in the process.